Improvement in spring-bolts



Odnted @Grant @stent @Mitre WILLIAM E. SPARKS, CE NEW HAVEN,CONNECTICUT, ASSIGNCR TC SARGENT St CC., CF SAME PLACE.

Letters Patent No. 111,693, dated February 7, 1871. f

vIMPROVEMENT lNA SPRING-BOLTS.

The Schedule referred to in these Letters Patent and making part of thesame.

thereon, to be a full, clear, and exact description ot the same, andwhich said drawing constitutes part of this speeih'cation, andrepresents in- Figure l, a side view;` Figure 2, an end view;

V Figure, a longitudinal central section; and in Y Figure 4, a sectionalview, tc more fully illustrate.A

my invention. y

This invention relates to an impro-vement in that class of boltscommonly called spring-bolts or eupboard-latcl1es,that is, a latch-boltwitha beveled nose,

vcombined with a spring to throw the bolt from the ease, and a knobfixed to the bolt, by means of which it is drawn into-the case.

Heretofore these bolts have been .constructed with a knob extendingthrough a slot in the case und fixed to the bolt, the base of the knobbeing ot' larger diameter than the width of the slot, and bearing uponthe surface of the case to sustain the bolt in its position. Thisconstant rubbing oi' the knob upon the oase soon disigures the surfaceof the case, a difficulty which, by my invention,'is entirely overcome.

'.lo more fully illustrate my improvement l show in fig. 4 a sectionalview of bolt of common construction, in which it willbe observed thatthe knob A necessarily bears `upon the surface ofthe case B, `for,

if it didnot, as' the bolt was drawn back the bevel'of the nose wouldallow the bolt to drop, as denoted in broken lines; hence the entiresupport ot the bolt is dependent upon the base ofthe knob bearing uponthe outside surface of the case.

My invention consists in- Constructing the bolt with theI two sidesinclined inward, making the inside of the bolt narrower than theoutside, and the bolt-opening in the case of the sanne form, whereby thebolt, in what-ever position, will take its bearing in the openingthrough the case.

C is the case, and may be of any of the usual forms of construction, andprovided with the usual means -or securingto the door.

D, the bolt, is beveled in the usual. manner, but is formed withinclined sides, as seen infig. 2, making it narrower npon the lower orinside.

The bolt is provided with a spring, E, to force it forward, also in theusual manner. l 'lhrough a slot, a, in the case a knob,'F, is set intothe bolt l), without any bearing surface upon the case, and, when thebolt is drawn in to its fullest extent, the widest portion still .restsin the opening through the' case, and, in consequence of the inclinedsides ot' the opening, cannot fall from that/position, thus making thebolt'.selfsupportiug.

It desirable, the base ot' the knob may be enlarged so astocorer theslot in the case, and this without coming in Contact with the case.-

I claimas my invention- Inspring-bolts or latches, the bolt D',construct-ed with inwardly-inclined sides, and the ease with aeorresponding opening to form 'abearing forthe bolt, to support it indrawing or when drawn into the oase, substantially in the manner and forthe purpose set forth.

witnesses: WILLIAM n. SPARKS.

J. H. SHU'MWAY, A. J. TIBBITS,

